The answer is 3.6-2 =4 (4 is the number above the 6 & 2.9-? =6 ( 6 is the number above 9 & ?19-10 =9 (9 is the number above 9 & ?7-6 =1 (1 is the number above 7 & 610-7 =3 ( the ? is above 10 & 7, so ?=3.